<?php
/*
 *  $Id: Unique.php 7490 2010-03-29 19:53:27Z jwage $
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * This software consists of voluntary contributions made by many individuals
 * and is licensed under the LGPL. For more information, see
 * <http://www.doctrine-project.org>.
 */

/**
 * Doctrine_Validator_Unique
 *
 * @package     Doctrine
 * @subpackage  Validator
 * @license     http://www.opensource.org/licenses/lgpl-license.php LGPL
 * @link        www.doctrine-project.org
 * @since       1.0
 * @version     $Revision: 7490 $
 * @author      Konsta Vesterinen <kvesteri@cc.hut.fi>
 */
class Doctrine_Validator_Unique extends Doctrine_Validator_Driver
{
	/**
	 * checks if given value is unique
	 *
	 * @param mixed $value
	 * @return boolean
	 */
	public function validate($value)
	{
		if (is_null($value)) {
			return true;
		}

		$table = $this->invoker->getTable();
		$conn = $table->getConnection();
		$pks = $table->getIdentifierColumnNames();

		if (is_array($pks)) {
			for ($i = 0, $l = count($pks); $i < $l; $i++) {
				$pks[$i] = $conn->quoteIdentifier($pks[$i]);
			}

			$pks = implode(', ', $pks);
		}

		$sql = 'SELECT ' . $pks . ' FROM ' . $conn->quoteIdentifier($table->getTableName()) . ' WHERE ';

		if (is_array($this->field)) {
			foreach ($this->field as $k => $v) {
				$this->field[$k] = $conn->quoteIdentifier($table->getColumnName($v));
			}

			$sql .= implode(' = ? AND ', $this->field) . ' = ?';
			$values = $value;
		} else {
			$sql .= $conn->quoteIdentifier($table->getColumnName($this->field)) . ' = ?';
			$values = array();
			$values[] = $value;
		}

		// If the record is not new we need to add primary key checks because its ok if the
		// unique value already exists in the database IF the record in the database is the same
		// as the one that is validated here.
		$state = $this->invoker->state();
		if ( ! ($state == Doctrine_Record::STATE_TDIRTY || $state == Doctrine_Record::STATE_TCLEAN)) {
			foreach ((array) $table->getIdentifierColumnNames() as $pk) {
				$sql .= ' AND ' . $conn->quoteIdentifier($pk) . ' != ?';
				$pkFieldName = $table->getFieldName($pk);
				$values[] = $this->invoker->$pkFieldName;
			}
		}

		if (isset($this->args) && is_array($this->args) && isset($this->args['where'])) {
			$sql .= ' AND ' . $this->args['where'];
		}

		$stmt  = $table->getConnection()->getDbh()->prepare($sql);
		$stmt->execute($values);

		return ( ! is_array($stmt->fetch()));
	}
}